# -*- coding: utf-8 -*-
"""
 @Time    : 2021/1/25 上午11:50
 @Author  : tgy
 
"""

class Node:
    __slots__ = ['val', 'next', 'random']

    def __init__(self, val, next=None, random=None):
        self.val = int(val)
        self.next = next
        self.random = random


if __name__ == '__main__':
    ...
